Robert Allen Kepner
S. M. Henderson
Ajit K. Srivastava
United States. Congress. Senate. Committee on Patents
Petre Miu
N. I. Klenin
L. L. Christianson
Stephenson, James H.
E.S. Bosoi
Reynold M. Wik
Oliver Brunner Zimmerman
Guangnan Chen
United States. Bureau of Agricultural Engineering
Unknown Author
Harry L. Field
Mack M. Jones
Michael Williams
Dionysis Bochtis